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Area of Science:

  • Quantum optics
  • Quantum information science

Background:

  • Squeezed states are vital nonclassical resources for quantum technologies like cryptography and computing.
  • The quantum advantage scales with the squeeze factor, but is limited by medium nonlinearity and energy loss.

Purpose of the Study:

  • To experimentally investigate multistep distillation of squeezed states.
  • To overcome limitations imposed by the effective nonlinearity of the pumped medium.
  • To approach an infinite squeeze factor through distillation.

Main Methods:

  • Probabilistic subtraction of two photons for the first distillation step.
  • Emulation of two-copy Gaussification via simultaneous measurement of orthogonal quadratures.
  • Probabilistic postprocessing to enhance the squeeze factor.

Main Results:

  • The first distillation step increased squeezing from 2.4 dB to 2.8 dB.
  • The second distillation step (Gaussification emulation) further enhanced squeezing from 2.8 dB to 3.4 dB.
  • Demonstrated an approach to increase the squeeze factor beyond the medium's nonlinearity limit.

Conclusions:

  • Multistep distillation is an effective method for enhancing squeezed states.
  • This technique offers a pathway to greater quantum advantage in quantum computing and cryptography.
  • The experimental results validate the potential of distillation for generating high-quality squeezed states.